Electric isolation system.



N. 0. MGGLURE- ELECTRIC ISOLATION SYSTEM.

APPLICATION TILED 001218.190'1.

Patented July 6, 1909.

3 BHEETS-BHEBT 1.

WHI- i 4 a E Q 0 i In Me (A A l a m E o N E Witnesses awwehto'o v/mzazza m NATHANIELGMF EILUHE g I 351g flflozumf I I N 0. MQGLURE.

ELECTRIC ISOLATION SYSTEM.

APPLICATION FILED OOT. 18,1907.

Patented July 6, 1909.

3 SHEETS-SHEET 2.

Nv 0. MGGLURB. ELEU'IlRIG ISOLATION SYSTEM.

APPLIOATION FILED OGT.18,1907.

Patented July 6, 1909. a snnn'rs-snnnr a.

awmmtwa M -EJLUE NATHANIEL l1 GUM/M21 58 wit memes UNITED STATES PATENT OFFICE.

mrnanrnt cRooKsHANK McGLURE, or HEALDSBURG, CALIFORNIA.

ELECTRIC ISOLATION SYSTEM.

Specification of'Letters Patent.

Patented July 6, 1909.

' A noau nnied 0mm 1s,.1so7. Serial No. 398,054.

on the said circuit by ringing a -belor by other signal, without disturbing the others; and when such call is answered, toenahle the parties to communicate with each other without being heard vby other parties on the same line. I

In other words, my invention relates to an electric-current controlling apparatus to be used in connection with telephones, telegraphs, etc.

It consists in devices whereby an operator in the above named system would be able to have such full control of the electric current used that he would be able by suitable-signal to call up any ofiice or instrument upon the electric circuit without disturbing the other ofiicesor instruments on the same line, and to hold communication with the said office or instrument to the exclusion of all other offices or instruments upon the said circuit.

My invention also comprises details of construction which will be more fully explained with reference to the accompanying drawings, in which Figure 1 isa diagram showing the general arrangement and connections for the central ofl'ice and four telephones representing substations of a party telephone line operated over wires or and Fig. 2 is the front elevation of the central station indicator. Fig. 3 is asectional side elevation of the same. Fig. 4 is a horizontal longitudinal section of the same. Fig. 5 shows diagrammatically the circuits in each telephone; and Fig. 6 is a sectionalyiew on line6-6 of Fig. 5, of the hanger arm or switch and its contact plates. V

In order to accom lish the desired object, I employ what I ca an isolating switch or meter A-fFigs. 2 and 3-having a=n1agnetic coil 2 oscillating in the space betweena 'core of softiron, and two magnetic pillars 4,-all being within the poles of permanent magnet 5. The magnetic coil 2 oscillates upon itsiaxis and is movedby the action of an electric current passing through the coils, its proper poise-being also assisted by oppositely acting coilsprings 6; There is also used a suitable controller R-Fig. 1 to regulate the electric current to he introduced. Upon the axis of the oscillating coil 2, an arm 7 of aluminum or other suitable material is rigidly secured. The device is to be so constructed that the pointer thus attached to the oscillating coil will be able to describe an arc B of at least 90 degrees. the oscillating tip of the pointer, are to be placed any desired number of divisions 9, the number to correspond with the number of instruments or offices on the circuit. The indicating marks or figures ol' the division of the are are so placed that each will be directly under, the tip 8 of the pointer arm 7 as it swings over the are. In each individual tele- In this are and under I phone or sub-station where this system is used, there is to be connected a similar device or meter A with the exceptlon that in- -stead of there being a series of marks or figures under the pointer there shall be a magnet 9, each occupying a ditl'erent position in the are. In the same radial plane with the poleoi this magnet, Figs. 3 and 5, but farther from the oscillating coil, are placed two contact plates 10 and 10 of copper or other suitable material. These plates are to be placed sufliciently near the magnet so that, as the pointer moves in its arc, they will be within the radial line of its tip.

Each magnet and pair oi contact plates are to be secured upon a suitable frame prop erly fastened and so adjusted that the magnet will be Within a proper sphere of influence to attract the pointer as it rests over the magnet when a current of electricity is passed through the magnet so that the pointer will rest upon the said .magnet, and when attracted by the magnet will rest also upon the two contact plates thereby connecting them. This magnet in each instrument is to be so adjusted that it will be, in point of location, homologous to its number in the instrument under the control of the operator at the main oflice, but no two stations or instruments in thecircuit are to have their magnets in the same "homologous position: That is to say,-

the angular position of the radius of the contact plates and electro-magnet is different in each instrument, and corresponds in its angle to thezangle of its specific number in the arc of the central ofiiee indicator meter.

The switch arm C of each tele hoii Figs. 5 and 6- is to be so constructed that it will not cause any current to short circuit, being furnished on top and bottom with plates of copper m, or other suitable material, mounted on insulation, as in Fig. 6, so located that when the lever is holding the telephone receiver, or is closed, these plates .of copper will rest between the disconnected twin contact plates marked 11, 11, 12, 12,113, 13, thus connecting the twin plates, mateto mate, and when the receiver is not .on the hanger, the lever will rise b action of a spring t, and when the switch 1s thus opened into the elevated position, the copper platesand post 18 to wire (1 an post 19, through the meter A to 0st 20, wire (1, thence to contact late 12, t ence to wire 0, post 50, wire 0 an the ground, the operator introducingsufficient current by the controller R at the main office, to swing the pointer 7 over the position on the dial, Figs. 1 and 2, corresponding with the position of the magnet in t 1e instrument he desires to operate or ring up. This brings the iron tip 8 of the pointer over the magnet 9, and contact plates 10, ll)" of the desired station, see Fig. 3. The current is then by pressing the button a introduced from the wire a and post 23, to contact plate 11, wire 6, thence to magnet 9., thence to the ground wire 0, post and ground. This attracts the pointer 8 so that it rests upon the magnet and the contact plates 10 and 10, thus connecting the plates- 10 and 10. A current from the cells n then flows through f and'e to contact plates 11,

thence to contact plates 9;, thence overe to contact plates 10 and 10, thence to contact plates 13, thence by wire f to the hell coils O,

' or other signaling instruments, thence task l-y wire f to the T; attery cells 11, causing such I signals as the operator may give by making and breaking the circuit a. When the receiver is taken from the switch arm C, the arm at once rises and opens the switch, and when the switch is opened, it lireaks all connections at the twincontact plates marked :0, 11, 12 and 13, and makes contact with twin plates 14, 15, 16 and 17; The lell O, or sig naling instrument, stops acting and the pointer 7 would at once drop lzack to zero were it not that the current through wire (1 from post 18,.passin through the meter at 19, 20, is interce'pte at W, and is carried over d to contact plates 17 which are so arranged that they will' receive the plates on the switch'before it has broken connection at late 12, thus the current is not allowed to neck, but passes over d and on to the ground wire c'-, and thus continues to hold the pointer over the magnet 9, and the plates 10 and 10'. The currentfromthe cells npasses over f to the magnet 9, thence over 9 to contact plates 16, back over 9", and

f thence to the cells n which gives continuous -attraction of magnet 9 for the pointer tip 8, and thus continues the contact for p ates 10 and 10 as long as the switch arm is in this position. The current from 23 now goes to contact plate 14, thence through c to the contact plates 10 and 10 thence through c to transmitter D of telephone (ortelegraph) thence to contact plates 15, through a to receiver E (or sounder) thence through c and binding post 50 to the ground wire 0. In order to rin up central or main office, the receiverE is left on the hanger, with the switch left closed, and the call is made to central by a given signal assigned to each office by pressing the button -marked S,

which is so arranged that when pressed it breaks the connection with the receiver E and transmitter D, and makes a connection with the battery from 23 to the ground wire, thus'sending the current over the wire a, which in turn rings a .vell or b'uz zer at central giving the numuer of office desiring communication.

The wire which connects the button S with the receiver wire, passes through a contact plate which is connected by a plate on pointer 7, while it rests at zero out is disconnected as soon as the pointer moves away from zero and regins to swing in its are. This prevents calling central while the line is in use or the accidental ringing of bells as the ointer asses over their magnets in thearc/ hese p ates should he so arranged that'they will not retard the free movement of: the pointer 7, and are to be insulated. The isoatingswitch may 1' e inclosed in a lJoX which is kept locked to prevent tap ing the line or o crating switch .Jy hand. ..here may be a g ass in front of switch'makin'g itvi'silfle so it can to seen when the line is in use by observ ing the pointer. This system may be applied to communication systems without an exchange, by simply using the controller and iJattGIIGS as shown in Fig. 1, at eachofiice or station or in connection with an exchange by connecting the two main wires a and b,

to their proper places in the switch hoard,

and the connections made from one division to another by (loulcle contact plugs. When no exchange is used and each oflice or station has a controller, etc. tapping the lines may be prevented by the operator introducing past all contacts on the are, thus no one else can use their controller and batteries to increase the current so as to make their own connections. For sending a general message to all stations there may Tze a second magnet laced. in the are under the pointer farthest l'romzero, and this may be made to operate all the instruments at once, its two contact plates and magnets being similarly connected to 9, 10 and 10. as the central may call up all of the line at one time by openin the circuit a first, and

then opening t e iso ating current asfar as des1re( In places where it 1s desired to operate 1n.-

dividual ower or light appliances or fixtures of any kind without disturbing other apparatus on the same system it may be done by applyingthe connection shown at the switch arm while closed, as shown in Fig. 5. Let ting the batteries n represent a source of power, and let the bells O, or their position 1n the circuit, represent such instruments or appliances as is esired to operate, they may be operated so'long as the current is the wire a to magnet 9.

By the use of my electric isolation system,

party lines may be used largely, thus obviat-' ing the necessity of great expense of constructing a large amount of wiring and still giving as comp ete isolation to the subscriber as does an individual line.

I claim:

1. In an electric isolation s ing telephone telegraph an "power circuit controllers the combination of a central office indicator meter, having an electro magnetically defleetable .arm and marks for indicating the amount of deflection, a current stem compris controller for regulating the amount of de flection, and an electric circuit, a series of substation instruments thereon, each having deflect-able arm, asecond c1reu1t, an electro magnet and two a similar electro magnetical contacts, said electro magnet of each substation being placed in the radial line of the defleetable arm, but in a different angu ar relation, to the magnet in every othergsubstation, and in homologousrelatlon to the in-. dicator marking at the central oflice meter corresponding to that of said substation, andconnected in series in the said second circuit, an. armature mounted on the end of, the deflectable arm, two contacts by the'said magnet, each su'bstations electro magnet bemg arranged near the plane of deflection of the deflectable arm, to attract the said armature and close the contacts whenever the specific and individual amount of deflection of any substation arm has been obtained, through the controller, the amount of current However this is optional I l sent over thereon, each having a similar netically deflectable arm and being indicated in the central ollice meter and the current upon which the said magnet is located being closed by the operator at the central office.

2. In an electric isolation system, comprising telephone, telegraph and power circuit controllers the combination of a central oflice indicator motor having a magnetically deflectable arm and marks for indicating the amount of deflection, a current controller for regulating the amount of deflection, and an electric circuit, a series of substation instruments thereon each having a similar electro i magnetically deflectable arm, a second electric circuit and a series of electro magnets, one at each substation, the said electro magnet of each substation being placed in the radial line of the deflectable arm but in a different angular relation to every other magnet in. the series and in homologous relation to the indicator markin s of the central'oflice, corres .Onding to tile said subscriber and near the pane of deflection of the deflectable arm, an armature carried b the deflectable arm, two contacts by the sai magnet, each subscribers electro magnet being arranged to attract the armature carried by the deflectable. arm and close the contacts whenever the specific amount of deflection of any subscribers arm has been obtained through the controller and indicated b the meter arm at the cen-, tral station and the said second circuit is closed, a source of electrical energy in each of the said circuits, the said contacts by the magnets being connected with shunts on; which are located instruments of communi cation and signaling.

3. An. electric isolation system, comprising a central office indicator meter having an electro-.magnetically deflectable arm having on its axis'anoscillating coil, oppositely acting springs-for balancing the same, a permanent magnet with poles embracing the coil, a graduated plate with markings for indicating the amount of deflection of the arm, a current controller for re ulating the amount of deflection, a telephone circuit instruments electro-mag; coil, and an electro-magnet and two contacts, said electro magnet of each subscriber being laced in the radial line-of the deflectable arm ut in and a series of subscribers .a. different angular relation to every other subscriber and in a homologous relation to the indicator markings'at the central office corresponding to that of said subscriber.

NATHANIEL GROUKSHANK MeOhURE.

Witnesses.

JOHN NORTON LoUcnBoRoUeH," WILLIAM ALoNzo VINsoN. 

